The Sandia National Laboratories' Mixed Waste Landfill (MWL) is located in a growing, urban area above the aquifer that supplies Albuquerque's municipal wells. The MWL wastes were dumped in unlined pits and trenches, with no engineered system in place for detection and collection of toxic liquids moving beneath the dump.

By today's health and safety standards mixed radioactive and hazardous wastes should never be disposed of a mile away from a children's park and residential homes. Yet, that is what Sandia and the New Mexico Environment Department (NMED) have decided to allow without having reliable information about the movement of the wastes beneath the dump.

The MWL is near the Mesa del Sol residential development for 80,000 to 100,000 people, the Pueblo of Isleta lands and communities in the South Valley. The 2.6-acre dumpsite has an estimated 1,500,000 cu ft of radioactive and mixed hazardous wastes from making nuclear weapons. The wastes lie above Albuquerque's drinking water aquifer in plastic bags, cardboard boxes and steel drums. Sandia officials cannot fully say what is really in the MWL dump. Contamination is present now in the groundwater below the MWL dump.

The DOE uses the MWL dump as a success model for how DOE should dispose of radioactive wastes under dirt covers at Sandia, Los Alamos National Laboratory and other sites in the nuclear weapons complex.

No reliable groundwater monitoring network has ever been in place to monitor the groundwater beneath the dump. The New Mexico Environment Department, the Environmental Protection Agency and DOE/Sandia knew in the early 1990s that the groundwater monitoring wells were put in the wrong locations at the MWL dump. The agencies knew also that the wells had corroded well screens and were contaminated with Bentonite clay that hides evidence of contamination. Shortly after four monitoring wells were installed it was learned that the flow of groundwater was not to the northwest, but to the southwest. The monitoring wells were providing data that could not possibly be accurate. Nevertheless, the NMED accepted the erroneous data to make the decision in 2005 to leave the MWL dump wastes in place under a dirt cover.

              A congressionally appointed commission called WERC investigated the MWL but was not provided information regarding the out of place, defective groundwater monitoring network. The flawed data was accepted by WERC as correct and as being from a reliable monitoring network.

Sadly, witnesses for Sandia and the Environment Department testified at the public hearing in 2004 for the dirt cover remedy that there were reliable monitoring wells and "no evidence of contamination to the groundwater." The government witnesses knew that the monitoring network was in the wrong location, incapable of detecting contamination and that the data from the wells was not reliable to make the remedy decision to leave the wastes in place.

Sandia Labs saved hundreds of millions of dollars by not treating or excavating the wastes while putting public health and the environment at risk.

Citizen Action and Registered Hydrogeologist Robert Gilkeson filed a complaint in 2007 with EPA Region 6 that the monitoring well network was defective.

             A $275,000 investigation (April 2010) by the Environmental Protection Agency Office of Inspector General found that EPA Region 6 staffers had concerns similar to Citizen Action's about the landfill's affect on groundwater and the lack of effective groundwater monitoring at theMWL dump. However, the Inspector General also found the Oversight Report of the EPA staff's MWL dump concerns ar e still being kept secret from Citizen Action and the public.

               EPA Region 6 and the EPA Office of Inspector General are both withholding secret documents that show the groundwater monitoring at the MWL dump did not support the decision to leave the wastes in place under a dirt cover.  Also, see here.

New Mexico Environment Department uses flawed data and disregards public concerns.

The New Mexico Environment Department sued Citizen Action to keep a 2006 TechLaw, Inc. report secret until late 2009. NMED commissioned the expert TechLaw report with taxpayer money. The TechLaw report reveals flaws in the dirt cover construction for long term protection and rejects Sandia's computer modeling for movement of the dump's wastes as a "black box" that should not be used. NMED withheld the TechLaw report during public meetings about wastes reaching groundwater. NMED withheld the TechLaw report from the EPA Inspector General. NMED used the flawed Sandia computer model in responses to wave aside public concerns.

New wells installed in 2008 are too deep to monitor at the water table level for detection of contamination. The well screens are too long at 30 feet. The sampling is done improperly. Sandia, EPA and the NMED know that data from the well monitoring network is highly flawed. Nevertheless, Sandia continues to submit the false data, NMED continues to accept the false data for decisions and EPA continues to withhold its reports from the public.

Sandia maintains that no liquids were in the MWL dump. However, for five decades, storm water run-on pooled in the unlined pits and trenches. 271,500 gallons of reactor coolant wastewater containing hexavalent chromium was deposited in Trench D at the MWL. 5,000 gallons of water were pumped into a trench to extinguish a depleted uranium fire in 1974. From June 2006 through July 2007, heavy rainfall breached berms that were supposed to prevent storm water from flowing across the site.

The MWL dump wastes have already begun to enter the groundwater. Nickel, chromium, cadmium and nitrates appeared in older defective monitoring wells that were installed in 1988 and 1989. Soil vapor studies conducted in 2007 show that cancer causing volatile organic solvents are moving deeper beneath the MWL dump. The presence of the dirt cover will actually accelerate the movement of solvents to the groundwater. Tritium concentrations are ten times higher and found at deeper levels than a decade ago.

The dirt cover will not prevent releases of waste from nuclear weapons production to future generations. Radioactive wastes such as Plutonium and Americium placed in the MWL dump will remain dangerous to the air and water for tens of thousands of years.


Dave McCoy, Executive Director Citizen Action

POB 4276

Albuquerque, NM 87110

505 262-1862